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Old 11-22-2020, 02:01 PM   #1
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Removing Sink Drain sealed with Silicone Caulk

I am removing and replacing the sink drain in our master bath. The sink is porcelain. Newmar used silicone caulk to seal the drain flange into to top side of the sink. I am concerned that once I remove the large nut on the underside of the sink tailpipe that the drain will be "glued" in place and attempting to dislodge the drain pipe might crack or otherwise harm the porcelain.

Any ideas of how to loosen the sink drain?
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Old 11-22-2020, 02:10 PM   #2
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Funny that they used silicone and not plumbers putty ; but ; you should be able to remove without damage to the sink , if necessary a thin flexible blade ( feeler blade or alike) under the edge to start the silicone separating while pushing up from below.
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Old 11-22-2020, 02:15 PM   #3
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Quote:
Originally Posted by LK23 View Post
I am removing and replacing the sink drain in our master bath. The sink is porcelain. Newmar used silicone caulk to seal the drain flange into to top side of the sink. I am concerned that once I remove the large nut on the underside of the sink tailpipe that the drain will be "glued" in place and attempting to dislodge the drain pipe might crack or otherwise harm the porcelain.

Any ideas of how to loosen the sink drain?
Soak the edge of the drain basket where it meets the porcelain sink with Mineral Spirits .

Let it soak for 5 minutes . It will soften the silicone . Take a narrow plastic scraper and work around the edge . Remove what silicone you can peel off and soak the edge again.

If you plan on replacing the drain basket , you can use the plastic scraper to carefully pry up the edge of the basket while keeping the silicone wet with the Mineral Spirits . As you know , just be careful with the porcelain finish.
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Old 11-22-2020, 04:22 PM   #4
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I recently replaced all of my faucets. I too was surprised they used silicon and not plumbers putty. But I had zero problems removing the old drain, it pulled right out and cleaned up well in the sink. And another surprise the instructions on the new delta faucet stated to use silicon. That is what I did. It has has worked fine so far.
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Old 11-22-2020, 05:01 PM   #5
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Thanks,

Maybe I am overthinking this sink drain replacement but, based on my past experience, be prepared for the unexpected.

Rex
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Old 11-23-2020, 04:33 AM   #6
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LK23 makes a good point. On both of my faucets, the old ones had 8-10" copper tubbing coming off the faucets. The new Delta's only had copper tubbing that was 3-5" long. This means a little plumbing work to extend the Plex as it would not make the connection with out adding stress to the system by pulling on the plex (not good). I had to extend one line in both the kitchen and the bath. Not difficult to do if you have the tools.
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Old 11-23-2020, 05:12 AM   #7
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Silicone makes a good gasket material where parts are clamped (threaded connection of tailpiece). It is a poor adhesive so getting it apart as mentioned should work ok. The BIG issue w silicone is nothing will stick to it if there is ANY residue so cleaning of the sink surface is critical. When you think you have it all try again. I have had to use wet dry sandpaper after it looked clean and was surprised at the amount I still was removing. A wire brush in a drill is pretty effective. I sometimes tape off the surrounding area w 2 layers of masking tape to make sure I dont damage any surrounding area.
They do sell a liquid remover that I have read reports that it works but havent used it myself.
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